The relatively low value of Xe/Kr in the atmospheres of Earth and Mars seems to rule out meteorites as the major carriers of noble gases to the inner planets. Laboratory experiments on the trapping of gases in ice forming at low temperatures suggest that comets may be a better choice. It is then possible to develop a model for the origin of inner planet atmospheres based on volatiles delivered by comets added to volatiles originally trapped in planetary rocks. The model will be tested by results from the Galileo Entry Probe.

中文翻译：

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彗星，陨石和大气层。

Xe / Kr在地球和火星大气中的相对较低的值似乎排除了陨石作为稀有气体进入内部行星的主要载体。在低温下在冰块中捕获气体的实验室实验表明，彗星可能是更好的选择。然后，可以根据彗星传递的挥发物添加到最初捕获在行星岩石中的挥发物，为行星内部大气的起源建立模型。该模型将通过Galileo Entry Probe的结果进行测试。